JP4391938B2 - Automatic transmission - Google Patents

Description

  The present invention includes a drive shaft, an output shaft that is non-coaxial with respect to the drive shaft, a planetary gear device that is coaxial with the drive shaft, and an axial direction directly adjacent to a transmission case wall of the automatic transmission. At least one switching element for selectively transmitting at least one planetary gear set and the drive rotational speed of the drive shaft to the output element of the planetary gear set. The drive sprocket of the chain transmission is coupled to the output element of the planetary gear unit, is coaxially arranged with respect to the drive shaft, and the output side sprocket is connected to the output shaft via a constant transmission ratio transmission. In particular, it relates to an automatic transmission for automobiles.

  This type of automatic transmission is known from US Pat. The four-speed automatic transmission for an automobile is formed of a transaxle structure, and includes a torque converter as a starting element and a planetary gear device arranged coaxially with the torque converter. The turbine shaft of the torque converter forms the drive shaft of the planetary gear unit. The planetary gear set has two planetary gear sets, four wet clutches, two wet brakes, and two free wheels. By selective engagement of the switching element, the transmission input rotational speed is transmitted to the internal gear of the third planetary gear set as the output element of the planetary gear device. The second planetary gear set is directly adjacent to the transmission case wall, and the torque converter is adjacent to the opposite side of the transmission case wall to the second planetary gear set. The internal gears of the second planetary gear set are simultaneously formed as a chain transmission device / drive sprocket and supported on a stator shaft attached to the torque converter. The output side sprocket of the chain transmission device is arranged in parallel to the second planetary gear set, and transmits the output rotational speed of the planetary gear device to the sun gear of the output side planetary gear set connected downstream. The internal gear of the output side planetary gear set is fixed to the transmission case wall. The planetary gear carrier of the output side planetary gear set is coupled via a differential to the output shaft of the automatic transmission that extends parallel to the drive shaft. Since the chain transmission extends in the axial direction radially outward of the second planetary gear set, a compact structure with a small required axial space for a four-speed automatic transmission in an automobile results.

  Patent Document 2 discloses a development form of the 4-speed automatic transmission described in Patent Document 1 to a 5-speed automatic transmission. Similarly, the automatic transmission having a transaxle structure has a torque converter as a starting element and a planetary gear device arranged coaxially with respect to the torque converter. The planetary gear device is provided with a third planetary gear set, another two wet brakes, and a third freewheel as compared with the one of Patent Document 1. The third planetary gear set is disposed on the opposite side of the transmission from the torque converter and operates as an overdrive transmission. The internal gear of the second planetary gear set likewise forms the output element of the planetary gear set and at the same time is formed as the drive sprocket of the chain transmission, which drive sprocket extends in parallel to the torque converter Linked to the output shaft of the machine. Unlike Patent Document 1, the required axial structure space of the 5-speed automatic transmission is considerably increased by the auxiliary overdrive transmission device arranged coaxially with respect to the drive shaft.

In Patent Document 3, a 6-speed automatic transmission is known. In the case of the automatic transmission, the planetary gear device arranged coaxially with respect to the drive shaft of the automatic transmission includes a front planetary gear set that operates as a speed reducer, and a multi-row shape formed as a Ravigneaux type gear device. It has a main planetary gear set, three wet clutches, and two wet brakes. By the selective engagement of the switching element, the driving rotational speed of the driving shaft is transmitted to the output element of the planetary gear device. The output element of the planetary gear set is formed as an internal gear of the main planetary gear set and is coupled to the first spur gear of the four-gear spur gear stage. The fourth spur gear on the output side of the spur gear stage is coupled to the output shaft of the automatic transmission that extends parallel to the drive shaft via a differential. The spur gear stage is spatially arranged between the drive engine and the planetary gear unit of the automatic transmission in the axial direction, on the one hand directly adjacent to the clutch and on the other hand the drive engine side transmission case wall Is directly adjacent to. Based on the special gear concept and adopting a switching element inside the transmission instead of a torque converter as a starting element, the required axial structure space of the 6-speed automatic transmission is the above-described 4-speed Comparable to the required axial structural space of automatic transmissions.
US Pat. No. 4,938,097 US Pat. No. 5,261,862 German Patent Application Publication No. 19932613

  It is an object of the present invention to form an automatic transmission of the type described at the outset with a non-coaxial drive shaft and an output shaft so that the required axial structural space is minimized.

  This problem is solved by an automatic transmission having the features of claim 1. Advantageous embodiments and developments of the invention are described in the dependent claims.

  An automatic transmission according to the present invention starts from the above-described prior art, and includes a drive shaft, an output shaft that is non-coaxial with respect to the drive shaft, and a planetary gear device that is disposed coaxially with respect to the drive shaft. And a chain transmission device with a constant transmission ratio, the drive sprocket of this chain transmission device is coupled to the output element of the planetary gear device and is arranged coaxially with respect to the drive shaft, and the output side sprocket has a constant transmission ratio. It is linked to the output shaft via a transmission. The planetary gear set has at least one planetary gear set and at least one switching element for selectively transmitting the drive rotational speed of the drive shaft to the output element of the planetary gear set. In other words, the planetary gear device generates a variable transmission ratio of the driving speed of the automatic transmission, and from this variable transmission ratio, the automatic transmission is automatically performed via the constant transmission ratio transmission device between the drive sprocket of the chain transmission device and the output shaft. An output transmission ratio of the transmission is generated.

  As in the prior art, the output element of the planetary gear set is formed as an internal gear. However, unlike the above-described prior art, the internal gear is preferably coupled to the drive sprocket of the chain transmission via a spline. As a result, noise transmission from the planetary gear unit to the chain transmission is cut off satisfactorily.

  The chain transmission is directly adjacent to the transmission case wall of the automatic transmission in the axial direction. In accordance with the invention, the drive sprocket of the chain transmission surrounds at least partly the radial direction in the axial direction the switching element directly adjacent to the side opposite to the transmission case wall in the axial direction.

  That is, unlike the above-described prior art, the chain transmission is disposed directly between the transmission case wall and the switching element of the planetary gear device in the axial direction in a spatial view. The transmission case wall is present on the drive engine side of the automatic transmission, for example.

  The special formation of the chain transmission and drive sprocket provides a particularly space-saving axially nested arrangement of the components of the planetary gear set arranged coaxially with the drive shaft of the automatic transmission. Thus, an automatic transmission having a short structure in the axial direction can be obtained. The width of the chain transmission is determined by the output torque of the planetary gear unit. The output torque of the automatic transmission, which is considerably larger than the output torque of the planetary gear device, is first generated by a constant transmission ratio transmission device arranged behind the chain transmission device in the direction of power flow. For example, a spur gear stage of a 6-speed automatic transmission disclosed in Patent Document 3 is replaced by a chain transmission device according to the present invention and a planetary gear set that generates a constant transmission ratio that is connected downstream of the chain transmission device. This reduces the axial structural length of the automatic transmission by approximately half the width of the bevel spur gear arranged coaxially with respect to the drive shaft. This is in particular because the bearings of the chain transmission and the drive sprocket need only be designed for very little axial force compared to the spur gear bearings.

  The automatic transmission according to the present invention is preferably employed as a vehicle transmission for a power transmission system having a drive engine arranged perpendicular to the traveling direction. In the case of the automobile transmission, in the state of use, a small axial structure space is obtained by design with respect to the transmission that is flange-coupled to the rear of the engine when viewed in the longitudinal direction of the engine.

  In a preferred embodiment of the invention, the drive sprocket of the chain transmission is directly adjacent to the disc holder of the switching element in the axial direction, in particular directly to the outer disc holder formed as a clutch cylinder. The servo device of this switching element is disposed on the chain transmission device / drive sprocket side of the switching element. The drive sprocket of the chain drive surrounds the disk of this switching element at least partially in the axial direction from the radially outer side. The switching element is formed as a clutch and a brake.

  In another advantageous embodiment of the invention, the drive sprocket of the chain transmission is supported on a case protrusion of a transmission case wall extending in the direction of the chain transmission in the axial direction. Alternatively, the drive sprocket of the chain transmission can also be supported on a shaft that is rigidly coupled to the transmission case. Such a case-fixed shaft is, for example, a stator shaft of a fluid torque converter used as a starting element of an automatic transmission. The bearing is advantageously formed as a thrust / radial needle bearing which saves structural space. This is because when designing for radial loads, it is only necessary to consider the tensile force of the straight tooth sprocket, and the axial support force is almost only the axial thrust of the output element of the planetary gear set, i.e. the inclination of the internal gear. This is because it only occurs in the teeth. This transmission system is at least almost free of tilting forces caused by, for example, inclined teeth. The omission of the conventional biased tapered roller bearing device not only favors the required axial structure space, but also favors the efficiency of the automatic transmission.

  The drive sprocket and output side (driven) sprocket of the chain transmission are installed centered with respect to a common transmission case component, for example formed as a transmission case wall or a converter bell-shaped cover, so that the chain Transmission alignment errors are minimized.

  In order to lubricate the chain transmission, a separate injection pipe is provided on the inner surface of the chain to spray lubricant from the inside. Instead of this injection tube, at least one correspondingly sized hole or orifice is formed directly on the stator shaft or case projection which supports the drive sprocket of the chain transmission, and the lubricant is present there. Supplied to the inner side of the chain.

  In another embodiment of the present invention, particularly in connection with the arrangement of the chain transmission near the engine, the automatic transmission lubricant supply oil pump supports the drive sprocket of the chain transmission (near the engine). Built directly into the transmission case wall. Alternatively, the oil pump can be incorporated into a shaft (particularly the stator shaft) that supports the drive sprocket of the chain transmission. This results in an automatic transmission structure that is very compact in the pump range and saves structure length.

  As in the prior art, the output side sprocket of the chain transmission is coupled to the input element of the output planetary gear set, the output planetary gear set together with the constant transmission ratio transmission of the chain transmission and the output of the planetary gear set. The output rotation speed of the output shaft is generated from the rotation speed. In this case, the sun gear preferably forms the input element of the output planetary gear set, the planetary gear carrier forms the output element, and the internal gear is fixed to the transmission case wall. In particular, in an automatic transmission for an automobile having an engine / transmission unit arranged at right angles to the traveling direction, a normal differential gear is used as an output element of the output planetary gear set when viewed in the power flow direction. It is provided between the output shaft of the automatic transmission.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. In the drawings, the same parts are denoted by the same reference numerals.

  A first embodiment of an automatic transmission provided with a chain transmission according to the present invention in FIG. 1 relates to an automatic transmission for an automobile provided with an engine / transmission unit incorporated at right angles to the traveling direction. The transmission case 1 has a transmission case wall 2 on the side of a drive engine (not shown). In the illustrated embodiment, the transmission case wall 2 simultaneously forms a pump chamber for the oil pump 9. A torque converter 4 as a starting element of the automatic transmission is disposed on the drive engine side of the transmission case wall 2. A converter bell-shaped cover 3 surrounds the torque converter 4 and is screwed to the transmission case 1. The transmission case wall 2 is screwed to the converter bell cover 3. In another form, the transmission case wall 2 is directly screwed to the transmission case 1 or formed integrally with the transmission case 1. A converter neck (neck) 5 of the torque converter 4 is supported by the transmission case wall 2. The torque converter 4 is driven by the engine shaft 6 of the drive engine, and drives the drive shaft 7 of the automatic transmission. The stator shaft 8 supports the torque converter 4 with respect to the transmission case 1. For this purpose, the stator shaft 8 is screwed to the transmission case wall 2, and the stator shaft 8 passes through the transmission case wall 2 in the axial direction. The drive shaft 7 extends concentrically inside the stator shaft 8, and the stator shaft 8 extends concentrically inside the converter neck 5. The converter neck 5 drives an oil pump 9 for supplying lubricant and pressure medium to the automatic transmission via correspondingly formed splines. In the illustrated embodiment, the oil pump 9 is integrally incorporated in the transmission case wall 2 and sealed by a flange of the stator shaft 8 with respect to the inner chamber of the transmission case 1.

  A planetary gear arrangement comprising at least one switching element 10 and at least one planetary gear set 14 is arranged on the side of the transmission case wall 2 opposite to the drive engine, ie on the side opposite to the torque converter 4. 7 extends coaxially inside the transmission case 1. By selective engagement of the switching elements, which are not individually shown in detail, the drive speed of the drive shaft 7 is transmitted to the output element of the planetary gear unit, preferably at a plurality of speed stages. In the illustrated embodiment, the output element of this planetary gear set is the internal gear 15 of the planetary gear set 14. The switching element 10 is disposed on the transmission case wall 2 side of the planetary gear set 14.

  A chain transmission 18 is disposed adjacent to the transmission case wall 2 on the side opposite to the drive engine of the transmission case wall 2, that is, on the side opposite to the torque converter 4. The output speed of the planetary gear device is transmitted to the output device of the automatic transmission via the chain transmission device 18. The output device mainly comprises an output side planetary gear set 35, a differential device 39, and an output shaft of an automatic transmission formed here as output flanges 40 on both sides. The transmission ratios of the chain transmission device 18 and the output device are constant.

  The drive sprocket 19 of the chain transmission 18 has a disc-like portion 20 that is directly adjacent to the transmission case wall 2. In the illustrated embodiment, the disc-like portion 20 is supported on the bearing portion 24 of the stator shaft 8, that is, indirectly supported by the transmission case wall 2. For this purpose, the bearing portion 24 of the stator shaft 8 extends in the axial direction in the inner chamber of the transmission case 1 toward the switching element 10 or the planetary gear set 14, that is, in the direction opposite to the drive engine side. . In the illustrated embodiment, the bearing of the chain transmission / drive sprocket 19 includes a radial bearing 25, a case wall side thrust bearing 26, and a switching element side thrust bearing 27. The radial bearing 25 and the switching element side thrust bearing 27 are fixed in the axial direction by a retaining ring 28 on the bearing portion 24 of the stator shaft 8. Since the axial thrust of the internal gear 15 coupled to the drive sprocket 19 acts only slightly as a whole (as will be described later) and the stator shaft 8 is fixed to the case, the bearing device is It can be simply fixed in the axial direction. In order to lubricate the radial bearing 25, the bearing portion 24 of the stator shaft 8 simply has a radial lubrication hole, and the lubricant is conveyed from the inside to the bearing center of the radial bearing 25 through the lubrication hole. In different forms of the bearing device, the switching element side thrust bearing 27 can also be fixed on the bearing portion 24 of the stator shaft 8 in the axial direction, for example, a thrust / radial composite bearing can also be used. The required axial structural space of the above-mentioned bearing of this chain transmission device / drive sprocket 19 is advantageously reduced considerably compared to the tapered roller bearing of the bevel spur gear. This is because the chain transmission 18 has at least almost no pitching moment compared to the inclined spur gear, and the thrust bearings 26, 27 can be formed as needle bearings that are sized accordingly. Furthermore, the efficiency of the needle bearing is higher than that of the biased tapered roller bearing.

  In another form, the drive sprocket 19 of the chain transmission 18 may be supported on the case protrusion of the transmission case wall 2 that extends in the axial direction into the inner chamber of the transmission case 1.

  In the development of the bearings of the chain transmission device / drive sprocket 19, it is conceivable that only the radial bearing 25 is fixed directly on the bearing part 24 of the stator shaft 8 in the axial direction, for example by a retaining ring 28. On the other hand, the drive sprocket 19 of the chain transmission 18 is fixed in position relative to the transmission case 1 in the axial direction by transmission structural parts adjacent to the drive sprocket 19. As a result, the drive sprocket 19 is supported “floating” between the transmission case wall 2 (torque converter side) and the transmission case 1 (side opposite to the torque converter) in the axial direction. In this case, the switching element side thrust bearing 27 is, for example, directly adjacent to the flange-shaped portion of the drive shaft 7 or adjacent to the outer disk holder 11 of the switching element 10. Such a bearing arrangement advantageously saves thrust bearings, which further reduces the axial structural length of the automatic transmission.

  Of course, the radial bearing 25 and the thrust bearings 26 and 27 are formed as roller bearings or ball bearings in addition to needle bearings.

  The drive sprocket 19 of the chain transmission 18 is directly adjacent to the switching element 10 in the axial direction on the side opposite to the transmission case wall 2. The switching element 10 is formed as a clutch in the illustrated embodiment. In order to realize a structure that saves the structural length as much as possible, the drive sprocket 19 of the chain transmission 18 is formed in a cylindrical shape, and the cylindrical portion 21 of the drive sprocket 19 is outside the disc-shaped portion 20 of the drive sprocket 19. Following the diameter portion, it extends in the axial direction into the inner chamber of the transmission case 1 in the direction toward the planetary gear set 14. The cylindrical portion 21 of the chain transmission device / drive sprocket 19 surrounds the switching element 10 from the radially outer side in the axial direction. The chain 23 of the chain transmission 18 extends partly in the axial direction radially outside the radial bearing of the chain transmission / drive sprocket 19 on the bearing part 24 of the stator shaft 8 and at least partly in the axial direction. , Extending radially outward of the switching element 10. In the embodiment shown, the switching element 10 is completely arranged inside the cylindrical part 21 of the chain transmission / drive sprocket 19. The disk holder 11 formed as a clutch cylinder in the preferred embodiment of the switching element 10 is directly adjacent to the chain transmission device / drive sprocket 19, and the servo device 12 of the switching element 10 for operating the disk 13 is the switching element 10. Is disposed on the transmission case wall 2 side. The chain transmission device / drive sprocket 19 is meshed and coupled to the internal gear 15 of the planetary gear carrier 14 via the spline 16 on the side of the cylindrical portion 21 opposite to the transmission case wall 2. This spline 16 is best done, for example by a known procedure, with regard to good isolation of solid-borne sound from the chain transmission 18 and the planetary gear set 14. In the illustrated embodiment, the rotational speed detection disk 17 firmly coupled to the internal gear 15 is used to detect the output rotational speed of the planetary gear unit or the output rotational speed of the automatic transmission, and this rotational speed. In other forms, the detection disc 17 can be rigidly coupled to the chain transmission / drive sprocket 19 or can be integrated into the drive sprocket 19.

  The output side sprocket 22 of the chain transmission 18 is coupled to the sun gear 36 of the output side planetary gear set 35 and is supported in the radial direction in the transmission case 1. In the illustrated embodiment, the thrust bearing of the chain transmission device / output-side sprocket 22 is combined with the thrust bearing of the differential device 39 that is rear-connected to the chain transmission device / output-side sprocket 22 in the power flow direction. . Needle bearings that save structural space are utilized because almost no lateral force is applied to the chain transmission 18. Alternatively, another known bearing concept, such as a thrust / radial composite bearing, can also be employed here. In the illustrated embodiment, the sun gear 36 and the output sprocket 22 are formed in a multi-part structure and are screwed to a parking ratchet wheel 32 formed as a separate component. The parking ratchet wheel 32 has parking ratchet teeth 33, and the parking ratchet teeth 33 engage with a parking ratchet detent 34 to lock the output shaft of the automatic transmission. In other embodiments, the sun gear 36 and the output side sprocket 22, the output side sprocket 22 and the parking ratchet wheel 32, or all three components, ie, the sun gear 36, the output side sprocket 22 and the parking ratchet wheel 32, are integrated. Can be formed. The internal gear 37 is fixed to the transmission case wall 2. The carrier 38 of the output planetary gear set 35 forms its output element and is coupled to a differential 39, which is coupled to output flanges 40 on both sides.

  In the illustrated embodiment, an injection tube 29 is provided to lubricate the chain 23. This injection pipe 29 is also inserted in the chain direction of the chain 23 stretched between the drive sprocket 19 and the output side sprocket 22 of the chain transmission device in the axial direction. Lubricant is sprayed toward the inner peripheral surface of the chain 23 through the numerous holes of the injection pipe 29. In order to further improve the chain lubrication, a large number of radial lubrication holes 30 are provided in the range of the sprocket teeth in the cylindrical portion 21 of the chain transmission device / drive sprocket 19. Through these lubrication holes 30, the centrifugally injected oil is directly conveyed to the chain meshing portion. In order to prevent excessive splashing by the chain 23 immersed in the oil sump of the automatic transmission, a shielding plate 31 is provided.

  In an advanced form of chain lubrication, (at least one) annular groove is also provided on the inner peripheral surface of the cylindrical portion 21 of the chain transmission device / drive sprocket 19 in order to increase the supply efficiency of centrifugal injection oil through the radial lubrication hole 30. The radial lubrication hole 30 is opened in the annular groove. An auxiliary oil receiving ring may be provided on the outer peripheral surface of the disk holder 11 instead of or in addition to the annular groove on the inner peripheral surface of the cylindrical portion 21 of the chain transmission device / drive sprocket 19. The oil receiving ring dampens the centrifugally injected oil so that the lubricant volume flow through the radial lubrication holes 30 is increased. In another development of chain lubrication, the stator shaft 8 has at least one special lubrication hole through which the lubricant is sprayed onto the inner surface of the chain 23.

  FIG. 2 shows a second preferred embodiment of an automatic transmission having a chain transmission and a drive sprocket according to the present invention. Unlike the first embodiment in FIG. 1 described above, the stator shaft 8 now forms a converter case, i.e. a transmission case wall on the engine side, and has a correspondingly shaped disc-shaped part. The disk-shaped portion is screwed to the transmission case 1 via the converter bell-shaped cover 3. Of course, the stator shaft 8 can also be screwed directly to the transmission case 1. The oil pump 9 is directly incorporated in the stator shaft 8 while saving the structural length on the torque converter 4 side of the stator shaft 8.

  As in the embodiment of FIG. 1, the drive sprocket 19 of the chain transmission is disposed in the inner chamber of the transmission case 1 and is directly adjacent to the disk-shaped portion of the stator shaft 8 in the axial direction. Similarly to the embodiment of FIG. 1, the cylindrical bearing portion 24 of the stator shaft 8 extends in the axial direction into the inner chamber of the transmission case 1 in the direction toward the switching element 10 or the planetary gear set 14. As can be understood from FIG. 2, the bearing of the chain transmission device / drive sprocket 19 on the bearing portion 24 of the stator shaft 8 includes a radial bearing 25, a case wall side thrust bearing 26, and a switching element side thrust bearing 27. is doing. The entire composite bearing device of these three bearings 25, 26, 27 is now fixed in the axial direction on the bearing portion 24 of the stator shaft 8 via the retaining ring 28 together with the chain transmission device / drive sprocket 19. .

  The drive sprocket 19 of the chain transmission is formed as a cylinder that opens in the direction of the switching element 10 or the planetary gear set 14, and this cylinder comprises a disc-shaped portion 20 and a cylindrical portion 21 of the chain transmission / drive sprocket 19. And. The disk-shaped part 20 is directly adjacent to the disk-shaped part of the stator shaft 8. The cylindrical part 21 of the chain drive / drive sprocket 19 surrounds the switching element 10 and is connected to the internal gear of the planetary gear set 14 via the spline 16 from the side opposite to the converter, ie from the side opposite to the engine. 15 is engaged and joined. The internal gear 15 forms, for example, an output element of a planetary gear device arranged coaxially with respect to the drive shaft 7. A chain (not shown) of the chain transmission extends in the axial direction radially outward of the disk-shaped portion 20 of the chain transmission / drive sprocket 19 and at least mainly radially outward of the radial bearing 25 in the axial direction. Is extended.

  The switching element 10 is formed as a clutch and comprises a disk holder 11 which is preferably formed as a clutch cylinder for receiving the outer disk, which is connected to the drive shaft 7. The disk holder 11 is directly adjacent to the chain transmission / drive sprocket 19. In other forms, the disc holder can of course be formed as an inner disc holder.

  In FIG. 2, the parking ratchet teeth 33 with which the parking ratchet detents 34 for locking the output shaft of the automatic transmission are engaged in the radial direction are different from the drive sprocket 19 of the chain transmission (unlike the embodiment of FIG. 1). It is integrated. From a spatial point of view, the parking ratchet teeth 33 are arranged on the cylindrical part 21 of the drive sprocket 19 in the axial direction, beside the sprocket teeth, radially outside the disc 13 of the switching element 10. That is, a separate parking ratchet car is no longer needed.

  With reference to FIG. 3, a third preferred embodiment of an automatic transmission having a chain transmission and a drive sprocket according to the present invention will be described. In this embodiment, the switching element 10 axially adjacent to the chain transmission / drive sprocket 19 is now formed as a brake. Reference numeral 8 similarly denotes a stator shaft, and a drive sprocket 19 of the chain transmission is supported on the bearing portion 24 thereof. The disc holder 11, preferably formed as a cylindrical outer disc holder, is firmly connected to the hub 41. The hub 41 is meshed with the stator shaft 8 via splines formed accordingly, and is thus fixed to the case. The hub 41 is fixed on the stator shaft 8 in the axial direction via a support disk 42 and a retaining ring 28, and the retaining ring 28 is engaged with a corresponding groove of the stator shaft 8. In the illustrated embodiment, the support disc 42 has an auxiliary function of supporting in the axial direction a return element formed as a disc spring of the servo device 12 of the brake 10. Supply of the pressure medium to the servo device 12 is performed through holes and passages corresponding to the stator shaft 8.

  In order to support the chain transmission device / drive sprocket 19, radial bearings 25 formed as needle bearings and thrust bearings 26, 27 on both sides formed as needle bearings are used (as in the embodiment of FIG. 1). ing. The switching element side thrust bearing 27 is now supported via a hub 41, a support disk 42 and a retaining ring 28, whereby the chain transmission device / drive sprocket 19 is fixed in the axial direction with respect to the stator shaft 8 together with the bearing device. Has been.

Sectional drawing of 1st Embodiment of the automatic transmission provided with the chain transmission based on this invention. Sectional drawing of the principal part of 2nd Embodiment of the automatic transmission provided with the chain transmission based on this invention. Sectional drawing of the principal part of 3rd Embodiment of the automatic transmission provided with the chain transmission based on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transmission case 2 Transmission case wall 3 Converter bell-shaped cover 4 Torque converter 5 Converter neck 6 Engine shaft 7 Automatic transmission drive shaft 8 Stator shaft 9 Oil pump 10 Switching element 11 Disk holder 12 Switching element servo device 13 Switching Element disk 14 Planetary gear set 15 Planetary gear set internal gear 16 Spline teeth 17 Speed detection disk 18 Chain transmission 19 Chain transmission drive sprocket 20 Drive sprocket disc-shaped portion 21 Drive sprocket cylindrical Portion 22 Chain transmission device output side sprocket 23 Chain transmission device chain 24 Stator shaft bearing portion 25 Drive sprocket radial bearing 26 Chain transmission device / drive sprocket transmission case wall side thrust bearing 27 Chain transmission device / drive shaft Rocket switching element side thrust bearing 28 Retaining ring 29 Chain transmission pipe injection tube 30 Chain transmission drive / drive sprocket lubrication hole 31 Shield plate 32 Parking ratchet wheel 33 Parking ratchet teeth 34 Parking ratchet detent 35 Output side planetary gear set 36 Output side planetary gear set sun gear 37 Output side planetary gear set internal gear 38 Output side planetary gear set carrier 39 Differential gear 40 Output flange 41 Hub 42 Support disk

Claims (21)

Drive shaft (7), output shaft non-coaxial with respect to drive shaft (7), planetary gear device coaxial with drive shaft (7), and transmission case of automatic transmission in axial direction A chain transmission (18) with a constant transmission ratio directly adjacent to the wall (2), the planetary gear set having at least one planetary gear set (14) and the drive rotational speed of the drive shaft (7) At least one switching element (10) for selective transmission to the output element of the device, the drive sprocket (19) of the chain transmission (18) being coupled to the output element of the planetary gear set, (7) In the automatic transmission for automobiles, which is arranged coaxially with respect to the output sprocket (22) and is connected to the output shaft at a constant transmission ratio.
The drive sprocket (19) of the chain drive (18) has a switching element (10) directly adjacent to the side opposite to the transmission case wall (2) in the axial direction, at least partly radially outward in the axial direction. Surrounded by,
The drive sprocket (19) of the chain transmission (18) causes the disc (13) of the switching element (10) adjacent to the drive sprocket (19) of the chain transmission (18) to be at least partially radial in the axial direction. An automatic transmission characterized by surrounding from the outside.   2. The automatic transmission according to claim 1, wherein the drive sprocket (19) of the chain transmission (18) is directly adjacent to the disk holder (11) of the switching element (10) in the axial direction.   The servo device (12) of the switching element (10) adjacent to the drive sprocket (19) of the chain transmission (18) is disposed on the drive sprocket (19) side of the chain transmission (18) in the switching element (10). The automatic transmission according to claim 1, wherein:   2. Automatic transmission according to claim 1, characterized in that the switching element (10) adjacent to the drive sprocket (19) of the chain transmission (18) is formed as a clutch.   2. Automatic transmission according to claim 1, characterized in that the switching element (10) adjacent to the drive sprocket (19) of the chain transmission (18) is formed as a brake. The drive sprocket (19) and the output sprocket (22) of the chain transmission (18) are each installed centered with respect to the same transmission case component. Automatic transmission.   2. The vehicle transmission according to claim 1, wherein the transmission case wall (2) adjacent to the chain transmission (18) is on the drive engine side of the automatic transmission.   2. The automatic transmission according to claim 1, further comprising an injection pipe for spraying a lubricant toward an inner surface of the chain of the chain transmission device in order to lubricate the chain transmission device.   In order to lubricate the chain transmission (18), at least one hole or orifice for supplying lubricant to the chain (23) of the chain transmission (18) is provided on the drive sprocket (19) of the chain transmission (18). The automatic transmission according to claim 1, wherein the automatic transmission is formed in a range of sprocket teeth in the cylindrical portion.   The drive sprocket (19) of the chain transmission (18) has parking ratchet teeth (33) that engage the parking ratchet detent (34) of the automatic transmission to lock the output shaft of the automatic transmission. The automatic transmission according to claim 1, wherein:   The output side sprocket (22) of the chain transmission (18) is coupled to the parking ratchet wheel (32), and the parking ratchet wheel (32) locks the output shaft of the automatic transmission so as to lock the output shaft of the automatic transmission. 2. Automatic transmission according to claim 1, characterized in that it has parking ratchet teeth (33) which engage with a detent (34). The output sprocket of the chain transmission (18) (22), have a stop (34) and engages the parking ratchet teeth (33) back parking ratchet of the automatic transmission in order to lock the output shaft of the automatic transmission The automatic transmission according to claim 1, wherein:   The drive sprocket (19) of the chain transmission (18) is supported on the case protrusion of the transmission case wall (2) extending in the direction of the chain transmission (18) in the axial direction. The automatic transmission according to claim 1.   A bearing of the drive sprocket (19) of the chain transmission (18) is formed as a needle bearing or a roller bearing, and includes a radial bearing (25), a transmission case side thrust bearing (26), and a switching element side thrust bearing (27). The automatic transmission according to claim 13, comprising:   2. The automatic transmission according to claim 1, wherein the drive sprocket (19) of the chain transmission (18) is supported on a shaft that is rigidly connected to the transmission case (1).   16. An automatic transmission according to claim 15, characterized in that the shaft supporting the drive sprocket (19) of the chain transmission (18) is formed as a stator shaft (8) in the fluid torque converter (4).   16. Automatic transmission according to claim 15, characterized in that the oil pump (9) of the automatic transmission is integrated in the stator shaft (8). Drive shaft (7), output shaft non-coaxial with respect to drive shaft (7), planetary gear device coaxial with drive shaft (7), and transmission case of automatic transmission in axial direction A chain transmission (18) with a constant transmission ratio directly adjacent to the wall (2), the planetary gear set having at least one planetary gear set (14) and the drive rotational speed of the drive shaft (7) At least one switching element (10) for selective transmission to the output element of the device, the drive sprocket (19) of the chain transmission (18) being coupled to the output element of the planetary gear set, (7) In the automatic transmission for automobiles, which is arranged coaxially with respect to the output sprocket (22) and is connected to the output shaft at a constant transmission ratio.
The drive sprocket (19) of the chain drive (18) has a switching element (10) directly adjacent to the side opposite to the transmission case wall (2) in the axial direction, at least partly radially outward in the axial direction. Surrounded by,
A drive sprocket (19) of the chain transmission (18) is supported on the case protrusion of the transmission case wall (2) extending in the axial direction toward the chain transmission (18).
The bearing of the drive sprocket (19) of the chain transmission (18) is on the case protrusion of the transmission case wall (2) extending in the axial direction toward the chain transmission (18) or the transmission case (1 The automatic transmission is fixed in the axial direction by a retaining ring (28) on a shaft that is firmly connected to the shaft.   The radial bearing (25) is on the case protrusion of the transmission case wall (2) extending in the direction of the chain transmission (18) in the axial direction or on the shaft firmly coupled to the transmission case (1). The drive sprocket (19) of the chain transmission (18) is fixed in the axial direction by the retaining ring (28) and is driven by the flange-like part of the drive shaft (7) in the axial direction or the drive of the chain transmission (18). 19. Automatic transmission according to claim 18, characterized in that it is supported by a disk holder (11) of a switching element (10) adjacent to the sprocket (19). Drive shaft (7), output shaft non-coaxial with respect to drive shaft (7), planetary gear device coaxial with drive shaft (7), and transmission case of automatic transmission in axial direction A chain transmission (18) with a constant transmission ratio directly adjacent to the wall (2), the planetary gear set having at least one planetary gear set (14) and the drive rotational speed of the drive shaft (7) At least one switching element (10) for selective transmission to the output element of the device, the drive sprocket (19) of the chain transmission (18) being coupled to the output element of the planetary gear set, (7) In the automatic transmission for automobiles, which is arranged coaxially with respect to the output sprocket (22) and is connected to the output shaft at a constant transmission ratio.
The drive sprocket (19) of the chain drive (18) has a switching element (10) directly adjacent to the side opposite to the transmission case wall (2) in the axial direction, at least partly radially outward in the axial direction. Surrounded by,
An automatic transmission characterized in that the internal gear (15) of the planetary gear set (14) forms the output element of the planetary gear set.   The output side sprocket (22) of the chain transmission (18) is coupled to the sun gear (36) of the output side planetary gear set (35), and the internal gear (37) of the output side planetary gear set (35) is automatically shifted. 21. Automatic according to claim 20, characterized in that it is coupled to the transmission case (1) of the machine and the output shaft of the automatic transmission is linked to the carrier (38) of the output planetary gear set (35). transmission.

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